<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">{{this.currentCity}}</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper" v-for="item in hot" :key="item.id" @click="handleCityClick(item.name)">
                        <div class="button">{{item.name}}</div>
                    </div>
                </div>
            </div>
            <div class="area" v-for="(item,key) in cities" :key="key" :ref="key">
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div class="item border-bottom" v-for="innerItem in item" :key="innerItem.id" @click="handleCityClick(innerItem.name)">{{innerItem.name}}</div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import BScroll from 'better-scroll'
import { mapState,mapMutations } from 'vuex'
export default {
    name:'CityList',
    // props:{
    //     hot:Array,
    //     cities: Object,
    //     letter:String
    // },
    props:['hot','cities','letter'],
    mounted() {
        this.scroll = new BScroll(this.$refs.wrapper)
    },
    computed: {
        ...mapState({
            currentCity:'city'
        }) // 使用对象展开运算符将此对象混入到外部对象中
    },
    methods: {
        handleCityClick(city) {
            // alert(city);
            this.changeCity(city);
            this.$router.push('/'); //通过路由跳转到首页
        },
        ...mapMutations(['changeCity']) //有个mutations叫changeCity，把mutations映射到这个组件名字叫changeCity的方法里
    },
    watch:{
        letter() {
            // console.log(this.letter);
            if(this.letter){
                const element = this.$refs[this.letter][0]; //获取字母等于点击字母的area区域
                // console.log(element);
                this.scroll.scrollToElement(element);
            }
        }
    }
}
</script>

<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .border-topbottom
        &:before
            border-color: #ccc
        &:after
            border-color: #ccc
    .border-bottom
        &:before
            border-color: #ccc
    .list
        overflow: hidden
        position: absolute
        top: 1.58rem
        left: 0
        right: 0
        bottom: 0
    .title
        line-height: .54rem
        background: #eee
        padding-left: .2rem
        color: #666
        font-size: .26rem
    .button-list
        padding: .1rem .6rem .1rem .1rem
        overflow: hidden
        .button-wrapper
            width: 33.33%
            float: left
            .button
                margin: .1rem
                padding: .1rem 0
                text-align: center
                border: .02rem solid #ccc
                border-radius: .06rem
    .item-list
        .item
            line-height: .76rem
            padding-left: .2rem
</style>